Print environment variables for cargo test in extra verbose mode

Author: Kobzol

src/cargo/ops/cargo_test.rs

@@ -126,7 +126,7 @@ fn run_unit_tests(
         script_meta,
     } in compilation.tests.iter()
     {
-        let (exe_display, cmd) = cmd_builds(
+        let (exe_display, mut cmd) = cmd_builds(
             config,
             cwd,
             unit,
@@ -136,6 +136,11 @@ fn run_unit_tests(
             compilation,
             "unittests",
         )?;
+
+        if config.extra_verbose() {
+            cmd.display_env_vars();
+        }
+
         config
             .shell()
             .concise(|shell| shell.status("Running", &exe_display))?;
@@ -266,9 +271,14 @@ fn run_doc_tests(
             p.arg("-Zunstable-options");
         }
 
+        if config.extra_verbose() {
+            p.display_env_vars();
+        }
+
         config
             .shell()
             .verbose(|shell| shell.status("Running", p.to_string()))?;
+
         if let Err(e) = p.exec() {
             let code = fail_fast_code(&e);
             let unit_err = UnitTestError {

tests/testsuite/test.rs

@@ -4861,3 +4861,24 @@ error: unexpected argument `--keep-going` found
         .with_status(101)
         .run();
 }
+
+#[cargo_test]
+fn print_env_verbose() {
+    let p = project()
+        .file("Cargo.toml", &basic_manifest("foo", "0.0.1"))
+        .file("src/lib.rs", "")
+        .build();
+
+    p.cargo("test -vv")
+        .with_stderr(
+            "\
+[COMPILING] foo v0.0.1 ([CWD])
+[RUNNING] `[..]CARGO_MANIFEST_DIR=[CWD][..] rustc --crate-name foo[..]`
+[RUNNING] `[..]CARGO_MANIFEST_DIR=[CWD][..] rustc --crate-name foo[..]`
+[FINISHED] test [unoptimized + debuginfo] target(s) in [..]
+[RUNNING] `[..]CARGO_MANIFEST_DIR=[CWD][..] [CWD]/target/debug/deps/foo-[..][EXE]`
+   Doc-tests foo
+[RUNNING] `[..]CARGO_MANIFEST_DIR=[CWD][..] rustdoc --crate-type lib --crate-name foo[..]",
+        )
+        .run();
+}